List the number of members in all Mailman lists

Here’s a little bash script to display the name of all lists in your mailman site and the number of subscribers for each list, just run it in the same directory as your mailman binaries (/usr/lib/mailman/bin on Debian):

#!/bin/bash
LISTS=$((`./list_lists | wc -l` - 1))
LISTS=`./list_lists | tail -n$LISTS | awk '{ print $1 }'`
for i in $LISTS; do
    echo $i `./list_members $i | wc -l`
done

Protip: you can also just copy and paste the lines into your terminal so you don’t have to save it as a script.